Compared the image quality from the Canon C300 with the Sony FS100 @ normal, 500% and 1000%. I also added a converted AVCHD clip from the FS100 to Prores 422. There is not much difference from the 2 but it is a little bit cleaner.
Result: The Canon C300 has much more details and resolution in the image compared to the FS100. At 500%, the C300 shows it has a cleaner image compared the FS100. At 1000% magnification, the image from the FS100 is blurry while the C300 still has details in it.